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Income Taxes Textuals (Details)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 01, 2017
USD ($)
Apr. 01, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 22, 2017
Scenario, Forecast                
Investments, Owned, Federal Income Tax Note [Line Items]                
Alternative Minimum Tax Refund       $ 6.4        
Predecessor                
Investments, Owned, Federal Income Tax Note [Line Items]                
Cancellation of Debt Income $ 8,500.0              
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount   $ 0.0 $ 473.5     $ 0.0 $ 0.0  
Unrecognized Tax Benefits, Interest on Income Taxes Expense   2.1       0.4 2.1  
Operating Loss Carryforward           4,600.0    
Deferred Income Taxes and Tax Credits   (262.3)       (97.0) (138.3)  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   (5.2)       (7.5) 3.9  
Net Unrecognized Tax Benefit           20.1    
Unrecognized Tax Benefits, Interest on Income Taxes Accrued           5.0 2.4  
Income Tax (Benefit) Expense   (263.8)       $ (94.5) $ (207.1)  
Predecessor | Third-party Lender [Member]                
Investments, Owned, Federal Income Tax Note [Line Items]                
Cancellation of Debt Income 3,900.0              
Predecessor | Related Party Lender [Member]                
Investments, Owned, Federal Income Tax Note [Line Items]                
Cancellation of Debt Income 4,600.0              
Successor                
Investments, Owned, Federal Income Tax Note [Line Items]                
Executive Compensation Tax Deduction     $ 0.5   $ 0.5      
IRS Budget Sequestration Reduction Rate     0.07   0.07      
Unrecognized Tax Benefits, Interest on Income Taxes Expense     $ 4.8          
Change In Unreconized Tax Benefit     7.4          
Operating Loss Carryforwards 3,600.0 3,600.0            
Deferred Income Taxes and Tax Credits     (99.6)          
Deferred Tax Assets, Operating Loss Carryforwards, Domestic     3,600.0   $ 3,600.0      
Deferred Tax Assets, Operating Loss Carryforwards, State and Local     97.0   97.0      
Deferred Tax Assets, Tax Credit Carryforwards, Foreign 262.0 262.0 1.6   1.6      
Tax Basis of Investments, Gross, Unrealized Depreciation 587.0 587.0            
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax 91.3 91.3 91.3   91.3      
Tax Adjustments, Settlements, and Unusual Provisions     84.9          
Deferred Tax Assets, Tax Credit Carryforwards, General Business 97.4 97.4 97.4   97.4      
Deferred Tax Assets, Capital Loss Carryforwards $ 204.0 $ 204.0            
Deferred Tax Assets, Charitable Contribution Carryforwards     2.7   2.7      
Deferred Tax Assets, Operating Loss Carryforwards, Foreign     1,021.3   1,021.3      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     (17.3)   (2,400.0)      
Net Unrecognized Tax Benefit     12.7   12.7      
Decrease in Unrecognized Tax Benefits is Reasonably Possible     0.5   0.5      
Income Tax (Benefit) Expense     (161.0)          
Successor | US Deferred Tax Assets [Member]                
Investments, Owned, Federal Income Tax Note [Line Items]                
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     (900.0)          
Successor | Australia Deferred Tax Assets [Member]                
Investments, Owned, Federal Income Tax Note [Line Items]                
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     (1,500.0)          
Successor | Maximum                
Investments, Owned, Federal Income Tax Note [Line Items]                
Executive Compensation Tax Deduction     1.0   1.0      
Operating Loss Carryforwards     100.0   100.0      
Deferred Tax Assets, Tax Credit Carryforwards, Foreign     1.6   $ 1.6      
Successor | Foreign Tax Authority [Member]                
Investments, Owned, Federal Income Tax Note [Line Items]                
Deferred Income Taxes and Tax Credits     $ 260.4          
Before Corporate Tax Rate Change [Member] | Successor                
Investments, Owned, Federal Income Tax Note [Line Items]                
Federal Corporate Tax Rate               35.00%
After Corporate Tax Rate Change [Member] | Successor                
Investments, Owned, Federal Income Tax Note [Line Items]                
Federal Corporate Tax Rate               21.00%